Definition 7.6 [1]}
Let \(V \in \mathcal {G}_q(n,k)\)  and \(P_V(x)=x^{q^k}+\sum _{j=0}^i\alpha _jx^{q^j}\in \mathcal {L}_{n,q}\) , such that \(\alpha _i \ne 0\) . We define the gap of \(V\)  as \(gap(V)=k-i\) .

